What part of the scientific method did al-hasa discover?

Which statement best describes what happens when molecular compounds melt

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.

What are the coefficients to balance the following equation? ba+br2=babr2